Engine accessory



April 3, D. J. DESCHAMPS -E.'IAL 2,372,816

ENGINE ACCESSORY Filed Sept. 16, 1942 24 o U 12 I fig-2 M HHHHHH 2 4 Z6 Desire. J: Decifbzgs 4 Bernard Dpzw DW g'las C. Clafke Patented Apr. 3, 1945 ENGINE AccEssoaY Desire J. Deschamps, Rutherford, Bernard H. Dow, Nutley, and Douglas C. Clarke, Mountain Lakes, N. J assignors to Bendix Aviation Corporation, South Bend, Ind., a corporation of Delaware Application September 16, 1942. Serial No. 458,550

2 Claims. (Cl. 220 -4) This invention relates t internal combustion engines, and particularly tothe problem of constructing accessories in such manner-that they can conveniently, be, mounted upon an internal combustion engine, in such a position as to facilitate both the operation of the accessory and the attachment of other fittings (as for electric or particularly in the region allotted to thepower' plant.

Practically all engine accessories require fitbecome apparent from inspection of the followin specification when read with reference to the accompanying drawing wherein is illustrated the preferred embodiment. of the invention. It is to be expressly understood, however, that the drawing is for the purpose of illustration only, and is not designed as a definition of the limits of the invention, reference being had to the appended claims for this purpose.

Fig. 1 is a longitudinal sectional view of a pump adapted to be'driven by an internal combastion engine and mounted adjacent such en gine embodying the invention; and

tings for attachment of cables or conduits,

whether electrical, pneumatic, or hydraulic They also requirea fitting (usually a flange integral with the accessory housing) for attachment to the engine housing, for support thereon, adjacent the accessory drive-shaft. Moreover, through-bolts are usually employed to hold together the several housing sections-a sectional housing being employed because it is generally impractical, if not physically impossible to mount the entire assembly in a'single piece of metal.

Where the accessory carries fluid under pressure, as in pumps and fluid motors. there is a tendency to develop leaks along the mating surfaces of the housing sections, as through-bolts do not maintain the sealing pressure uniformly at all radial points, and in many instances even the spacing of the bolts lacks uniformity, because of lack of symmetry in thedesign. of the housing. The present invention solves this problem by providing means acting uniformly throughout the periphery of the housing to hold one housing section in tight, sealing relationship to the other.

An object of the present invention, therefore, is to provide an engine accessory construction involving novel means for retaining the several parts in assembled relationship.

A further object is to provide an accessory construction in which all conduit terminals are located on the rear end surface of the accesso y. where the conduits can most conveniently be attached.

Another object is to provide an accessory construction in which the major portion of the housing presents a smooth outer surface, and to which the conduit terminal end 01' the unit is attached without the use of screws or bolts:

These and other objects of the invention will V Fig. 2 is an end view of the pump shown in Fig. 1. I The illustrated pump is of a type in which an inner rotor 4 has continuous sliding contact with an outer rotor 5 which is rot'ated'by said inner rotor, but about an axis eccentric to the axis that is common to the inner rotor 4 and the shaft 3 which drives said rotor: the number of inter-engageable teeth of the inner rotor being one less'than that of the outer rotor and said teeth being formed as indicated in patent'to Hill No. 1,682,563 and in other patents of the same inventor. The shaft 3 is in turn adapted to be rotated by the engine driven member I which has splined connection with the outer extension 2 of the main pump shaft 3. Rotation of the pump elements 4 and 5 results in a pumping of fluid which the pump receives by way of the intake conduit which attaches to the intake terminal 6, the fluid entering the space between rotors 4 and 5 by way of a passage through the casting l and subsequently being delivered to the outlet conduit which attaches to the outlet conduit terminal 8 (Fig. 2) by way of another passage in the casting 7.

This casting I includes the two conduit terminals 6 and 8 as integral parts thereof, and is retained in assembled relationship to the rotors 4 and 5 by novel means comprising a smoothly machined barrel 9 having a circumferentially grooved portion II- in which is received a transversely cut circular ring I2 of resilient material such as spring steel, permitting the ring to be snapped into locking engagement as between the casting l and the grooved portion ll of the barrel in a fashion analogous to the insertion of a piston ring between a piston and cylinder of an internal combustion engine. As an additional means of completing the assembly. which includes the eccentrically bored rotor receiving element l3, there is employed a pin or dowel II V which passes through registering notches in the members I and I3 and is. of course, inserted prior to insertion of the split ring l2.

" The parts above enumerated are in turn seprovided with apertures 24 through which may pass the mounting screws or other means by whichthe pump is to be retained on the engine housing to be driven by the engine.

Those screws l8 which do not receive the attaching nuts 2| are adapted to enter counter-v bored recesses in the element [3, asindicated at 21 in Fig. 1. Thus, these alternately disposed screws constitute a means of securing the barrel 9 to the remainder of the assembly including the elements 4, 5, I and I3 prior to attachment to the final supporting plate l6. By the same token, they constitute a means for retaining the sub-assembly intact even though the said subassembly should be at any time removed from the supporting plate 16 as by removal of the nuts 2|.

Suitable sealing means include the cylindrical liners 3| and 32, the annular sealing rings 33 and the housing element or stufling box 34, which is held to the member I3 by the screws indicated at 35. A pin 36 extends through the center of the elements i and 2 to hold the former to the latter, but permitting axial p.ay therebetween within the limits of the compression spring 39; the assembly being locked to the pump by reason of the head formation 4| on one end of the pin and the locking ring 42 at the outer end, and also by reason of the flange H which prevents relative axial movement as betweer the elements 2 and 34 after the attaching screw: -35 have been inserted.

It will be noted that the embodiment illustrated is of such construction and inter-relatlonship of parts as to accomplish the above recited objects of the invention and additional]: possesses other advantages which will be apparent to those skilled in the art and which art embraced within the scope of the appended claims.

What is claimed is:

1. In a housing assembly, a pair of housing elements having confronting ating faces means for holding said elements in sufliciently tight relationship to prevent p age of fluid between said faces, said means inc uding an encircling member having a groove extending about its inner periphery circumiacent one or said elements, a split ring fitting into said groove and abutting said last mentioned element, said member provided with a flange abutting the other element, adjusting screws carried by said flange and engaging the other element and coactins with said ring for rendering said relationship effective, and a supporting plate secured to said other element and covering said screws.

2. The structure of claim 1 as set forth and defined therein including, conduits for said assembly carried by one of said elements and extending abaxially through said ring and outside of said member, and a dowel extending through said elements and confined therein by said ring for preventing relative rotation of said elements so as to maintain said conduits in fixity with both of said elements.

DESIRE J. DESCHAMPS. DOUGLAS C. CLARKE. BERNARDH. DOW. 

